Pen



FIG. 1 is a side view of a pen with a cap, where the view of the other side is a mirror image of FIG. 1;

FIG. 2 is a front view of the pen;

FIG. 3 is a rear view of the pen;

FIG. 4 is a top plan view of the pen;

FIG. 5 is a bottom plan view of the pen; and,

FIG. 6 is a second front view of the pen shown in an exploded condition. 

The ornamental design for a pen, as shown and described. 